 A spike protector, like most modern home appliances, is designed to be plugged into a 3-prong electric wall socket connected to an independent ground, as well as to the power-in and power-out lines.
The wire ground (designed to handle accidental shorts between the power lines and an appliance's metal housing — blowing fuse or circuit breaker in the process, but saving you a shock) is essential if a spike protector is to function.
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